[Misc] Update TritonLanguagePlaceholder to have attributes that are used by...

[Misc] Update TritonLanguagePlaceholder to have attributes that are used by Flash Linear Attention ops. (#26853)
Co-authored-by: Xudong Ma <mxd@meta.com>

vllm/triton_utils/importing.py

@@ -98,3 +98,6 @@ class TritonLanguagePlaceholder(types.ModuleType):
         self.int64 = None
         self.int32 = None
         self.tensor = None
+        self.exp = None
+        self.log = None
+        self.log2 = None